package T9_producer_consumer;

public class T9_produce_c{    
    public static void main(String[] args) {    
        Godown godown = new Godown(30);    
        Consumer c1 = new Consumer(50, godown);    
        Consumer c2 = new Consumer(20, godown);    
        Consumer c3 = new Consumer(30, godown);    

        Producer p1 = new Producer(10, godown);    
        Producer p2 = new Producer(10, godown);    
        Producer p3 = new Producer(10, godown);    
        Producer p4 = new Producer(10, godown);    
        Producer p5 = new Producer(10, godown);    
        Producer p6 = new Producer(10, godown);    
        Producer p7 = new Producer(80, godown);    

        c1.start();    
        c2.start();    
        c3.start();    
        p1.start();    
        p2.start();    
        p3.start();    
        p4.start();    
        p5.start();    
        p6.start();    
        p7.start();    

    }    
}    
class Godown {    
	public static final int max_size = 100; 
	public int curnum;    
	Godown() {    
	}    
	Godown(int curnum) {    
		this.curnum = curnum;    
	}    
	public synchronized void produce(int neednum) {    
		while (neednum + curnum > max_size) {    
			System.out.println("要生产的产品数量" + neednum + "超过剩余库存量" + (max_size - curnum) + "，暂时不能执行生产任务!");    
			try {    
				//当前的生产线程等待    
				wait();    
			} catch (InterruptedException e) {    
				e.printStackTrace();    
			}    
		}    
        //满足生产条件，则进行生产，这里简单的更改当前库存量    
        curnum += neednum;    
        System.out.println("已经生产了" + neednum + "个产品，现仓储量为" + curnum);    
        //唤醒在此对象监视器上等待的所有线程    
        notifyAll();    
	}    
	public synchronized void consume(int neednum) {    
        //测试是否可消费    
	while (curnum < neednum) {    
		try {    
                        //当前的生产线程等待    
			wait();    
		} catch (InterruptedException e) {    
			e.printStackTrace();    
		}    
	}    
        //满足消费条件，则进行消费，这里简单的更改当前库存量    
	curnum -= neednum;    
	System.out.println("已经消费了" + neednum + "个产品，现仓储量为" + curnum);    
        //唤醒在此对象监视器上等待的所有线程    
	notifyAll();    
	}    
}    
class Producer extends Thread {    
	private int neednum;                //生产产品的数量    
	private Godown godown;            //仓库    
	Producer(int neednum, Godown godown) {    
		this.neednum = neednum;    
		this.godown = godown;    
	}    
	public void run() {    
        //生产指定数量的产品    
		godown.produce(neednum);    
	}
}    
class Consumer extends Thread {    
	private int neednum;                //生产产品的数量    
	private Godown godown;            //仓库    
	Consumer(int neednum, Godown godown) {    
		this.neednum = neednum;    
		this.godown = godown;    
	}    
	public void run() {    
        //消费指定数量的产品    
		godown.consume(neednum);    
	}    
}  
